Minimizing the Output Voltage Ripple of a DC/DC Power Converter by Phase Locking

Upadhyaya, P.; Hess, H.L.

doi:10.1109/wmed.2007.368052

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2008

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“…Step-up dc-dc converters are most often required in applications such as handheld instruments, cellular phones, PDAs or laptops, but unfortunately either bulky inductors in switching converters or switched capacitors in charge pumps are required. Although inductorless circuits are generally preferred, due to EMI problems [2], charge pumps face voltage ripple [3,4] problems.…”

Section: Introductionmentioning

confidence: 99%

Optocoupler driving of MEMS electrostatic switches

Bermejo¹,

Molinero²,

Ortega³

et al. 2008

J. Micromech. Microeng.

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The dynamics of novel optocoupler direct driving of a microelectromechanical systems (MEMS) switch is described by means of PSpice simulations and experimental measurements. The output circuit of an optocoupler array is used to drive an electrostatic MEMS switch. It is shown that the optocoupler drive provides built-in dc voltage step-up conversion with no ripple, galvanic isolation and switching time and energy control in a similar way as current drive does. PSpice models describe the actuation theory including parasitic elements, which can modify the actuation characteristics. Comparison between theory and measurements shows that although there is great impact of parasitic parallel resistance and capacitance, current drive benefits are mostly preserved.

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Section: Introductionmentioning

confidence: 99%